Electricity: measuring and testing – Of geophysical surface or subsurface in situ
Patent
1987-04-13
1989-04-25
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
324 72, 324326, 324344, 324348, 340601, G01V 308, G01W 116, G01R 1900, G01R 2300
Patent
active
048251658
ABSTRACT:
A method and apparatus for locating and evaluating surface and subsurface anomalies by detecting, monitoring or measuring transient or local variations respectively which occur in an alternating component of a vertical current having a frequency characteristic which emanates from the earth'surface in the region being monitored or measured. For locating fixed anomalies, local variations which occur in the amplitude, frequency and frequency modulation of the alternating component of the vertical current are measured. For detecting the passage of moving or transient anomalies, a stationary detector is positioned to detect any change in the vertical alternating current leakage in the vicinity of the detector which is caused by a moving or transient anomaly such as a submerged submarine, seismic activity, or sustained severe wheather. For accuracy enhancement and redundancy, simultaneous measurements of the signal strength in multiple frequency bands may be used.
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Helms Ronald L.
Swanson Claude V.
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